Walmart offers the Boss Audio 12" Subwoofer, Amplifier, and Install Kit Combo, model no. B112SPKG, for $59 with free shipping. That's $40 off list price and the lowest total price we could find. It features a 500-watt two-channel amplifier, 12" 1,600-watt subwoofer, and an 8-gauge installation kit. Deal ends today.